[Hallicrafters] Any articles on 4-400A Grouded-Grid Amplifier ??

[David C. Hallam]

There was an Eimac Amateur Service Newsletter AS-4 by Bill Orr; The KW-2 An
Economy Grounded Grid Linear Amplifier.  It detailed how to construct and
operate a GG linear using either 4-125, 4-250, or 4-400.  It was probably
published in QST also.  You might try a search of the QST archives.

David
KC2JD

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Olaf Madsen
Sent: Sunday, February 19, 2006 3:22 PM
To: hallicrafters
Subject: [Hallicrafters] Any articles on 4-400A Grouded-Grid Amplifier
??


Hello Fellows,

I aquired a 1960's or 70's homebrew amplifier that uses very,very basic
grounded-grid circuitry,ala 1972 Handbook.

4-400A tube -- screen and grid directly grounded -- Filaments isolated with
B&W FC-30 Filament Choke. --No Input circuit,-- direct feed to
Cathode --National 175  RF Plate Choke--500pF TV doorknobs to by-pass and
couple to Pi-Network with B&W 851 switched Tankcoil (10-80 mtrs)---3000V on
the plate--NO PARASITIC SUPRESSION what-so ever.

The amplifier looks very impressive---nice frontpanel,meter and knobs and
Hallicrafters cabinet ala SX-42,SX-101 and the like.---The transformer
''weighs a ton''.--Fits right in with the other Hallicrafters Boatanchoers.

Can anyone lead me to an article that might have been used to build this amp
or cover the subject  (Tetrodes in GG )???---Of course,it wants to ''take
off'' just turning the Tuning or Output capacitors.

Tnx in advance es 73's---Olaf,---KF4TP---

______________________________________________________________
Hallicrafters mailing list
Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Hallicrafters at mailman.qth.net
----
List Administrator: Duane Fischer, W8DBF **for assistance**
dfischer at usol.com
----
Hallicrafters Collectors International: http://www.w9wze.org